#include <iostream>

int main(){
	using std::cout;
	using std::endl;

	int a = 20;
	int b = 20;

	cout << "a    = " << a << ":   nb = " << b << "\n";
	cout << "a++  = " << a++ << ":  ++b = " <<++b << endl;
	cout << "a    = " << a << ":    b = "  << b << endl;

	return 0;
}